下列对股票市盈率的简单估计方法中不属于利用历史数据进行估计的方法是( )。A．市场归

阅读短文，判断正误，正确的写“T”，错误的写“F”。

     Jim Green is a student at No. 14 Middle school. He has classes from Monday to Friday. He has many

things to do after class. On Monday and Wednesday he helps his friends with their English. On Tuesday

he makes modle planes. On Friday afternoon, he plays basketball. He goes to the park with his parents and

sister on Saturday. On Sunday, he has a good rest at home and does his homework.

( )1．Jim has classes from Monday to Saturday.

(     )2．Jim helps his friends with their English after class on Monday and Wednesday.

(     )3．Jim plays basketball on Saturday afternoon.

( )4．Jim helps his sister with her homework on Wednesday.

(     )5．Jim has a good rest at home on Sunday.

人体中哪些组织声衰减系数高并可能伴有声影()

A．肌腱

B．肌肉

C．脑

D．脂肪

E．肝脏

简述犯罪现场临场讨论中现场分析的内容。

发动机点火嘴有2个，只有在连续点火时，两个点火嘴才会一起工作。

A、对

B、错

使用针管注样时首先要（）。

A、拉出隔断阀

B、推进隔断阀

C、直接注

D、打开抽气